文章来源:http://www.blogjava.net/happyy2k/archive/2007/05/09/116081.html
Tags: springspring | c3p0c3p0 | 数据链接池数据链接池
2007-5-9 20:57:18 | 编辑
Spring 中 C3p0 connection pooling 的配置
C3p0 Document 在http://www.mchange.com/projects/c3p0/index.html
Spring 的 DataSource bean 定义如下, 把可变的变量抽出放在jdbc.properties file中, 方便修改 jdbc.properties file只要放在当前项目的classes路径下,或放在Tomcat 的Shared/classes下, Spring 就可以找到
<bean id="propertyConfigurer" class="org.springframework.beans.factory.config.PropertyPlaceholderConfigurer"> <property name="location"> <value>classpath:jdbc.properties</value> </property> </bean><bean id="dataSource" class="com.mchange.v2.c3p0.ComboPooledDataSource"> <property name="driverClass" value="com.mysql.jdbc.Driver" /> <property name="jdbcUrl" value="${jdbc.url}" /> <property name="user" value="${jdbc.username}" /> <property name="password" value="${jdbc.password}" /> <property name="autoCommitOnClose" value="true"/> <property name="checkoutTimeout" value="${cpool.checkoutTimeout}"/> <property name="initialPoolSize" value="${cpool.minPoolSize}"/> <property name="minPoolSize" value="${cpool.minPoolSize}"/> <property name="maxPoolSize" value="${cpool.maxPoolSize}"/> <property name="maxIdleTime" value="${cpool.maxIdleTime}"/> <property name="acquireIncrement" value="${cpool.acquireIncrement}"/> <property name="maxIdleTimeExcessConnections" value="${cpool.maxIdleTimeExcessConnections}"/> </bean>jdbc.properties
# Database URL
jdbc.url=jdbc:mysql://192.168.0.25"3306/db
# Database login information
jdbc.username=root
jdbc.password=
# Time to wait for an open connection before timing out
# (in milliseconds)
cpool.checkoutTimeout=5000
# Connection pool size
cpool.minPoolSize=5
cpool.maxPoolSize=40
# How long to keep unused connections around(in seconds)
# Note: MySQL times out idle connections after 8 hours(28,800 seconds)
# so ensure this value is below MySQL idle timeout
cpool.maxIdleTime=25200
# How long to hang on to excess unused connections after traffic spike
# (in seconds)
cpool.maxIdleTimeExcessConnections=1800
# Acquiring new connections is slow, so eagerly retrieve extra connections
# when current pool size is reached
cpool.acquireIncrement=5
JavaBeans-style Properties 具体每个属性的意义可以参考
http://www.mchange.com/projects/c3p0/index.html#configuration_properties
# Database URLjdbc.url=jdbc:mysql://192.168.0.25"3306/db# Database login informationjdbc.username=rootjdbc.password=# Time to wait for an open connection before timing out# (in milliseconds)cpool.checkoutTimeout=5000# Connection pool sizecpool.minPoolSize=5cpool.maxPoolSize=40# How long to keep unused connections around(in seconds)# Note: MySQL times out idle connections after 8 hours(28,800 seconds)# so ensure this value is below MySQL idle timeoutcpool.maxIdleTime=25200# How long to hang on to excess unused connections after traffic spike# (in seconds)cpool.maxIdleTimeExcessConnections=1800# Acquiring new connections is slow, so eagerly retrieve extra connections# when current pool size is reachedcpool.acquireIncrement=5